Then you're not doing what I'm describing. Open Facebook mobile in Safari (not the Facebook app). Go to a friend and open their friends list. Scroll down by swiping up in the white area between the names and pictures with your thumb. Notice the lack of responsiveness every 3-4 swipes.

Then you're not doing what I'm describing. Open Facebook mobile in Safari (not the Facebook app). Go to a friend and open their friends list. Scroll down by swiping up in the white area between the names and pictures with your thumb. Notice the lack of responsiveness every 3-4 swipes.

Probably the way Facebook loads long lists of friends (perhaps in general, or possibly in mobile browsers in particular).